/*
 *
 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY
 * DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT OF OR
 * RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE OR
 * ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE
 * FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT,
 * SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF
 * THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS
 * BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed, licensed or
 * intended for use in the design, construction, operation or
 * maintenance of any nuclear facility.
 * 
 */

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import cart.ShoppingCart;
import database.*;
import exception.*;

/**
 * An HTTP servlet that responds to the POST method of the HTTP protocol.
 * The Receipt servlet updates the book database inventory, invalidates the user session, 
 * thanks the user for the order. */

public class ReceiptServlet extends HttpServlet { 

  private BookDB bookDB;

  public void init() throws ServletException {
    bookDB =
          (BookDB)getServletContext().getAttribute("bookDB");
    if (bookDB == null)
        throw new UnavailableException("Couldn't get database.");
  }

  public void destroy() {
        bookDB = null;
  }
  public void doPost(HttpServletRequest request,
                      HttpServletResponse response) throws ServletException, IOException
  {
    boolean orderCompleted = true;
    // Get the user's session and shopping cart
    HttpSession session = request.getSession(true);
    ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
    ShoppingCart cart =
      (ShoppingCart)session.getAttribute("cart");
    if (cart == null) {
      cart = new ShoppingCart();
      session.setAttribute("cart", cart);
    }
    // Update the inventory
    try {
      bookDB.buyBooks(cart);
    } catch (OrderException e) {
      System.err.println(e.getMessage());
      orderCompleted = false;
    }

    // Payment received -- invalidate the session
    session.invalidate();
    
    // set content type header before accessing the Writer
    response.setContentType("text/html");
    response.setBufferSize(8192);
    PrintWriter out = response.getWriter();
    
    // then write the response
    out.println("<html>" +
                "<head><title>" + messages.getString("TitleReceipt") + "</title></head>" );

    // Get the dispatcher; it gets the banner to the user
    RequestDispatcher dispatcher =
      getServletContext().getRequestDispatcher("/banner");
                                    
    if (dispatcher != null)
        dispatcher.include(request, response);
       
    if (orderCompleted)              
      out.println("<h3>" + messages.getString("ThankYou") +
          request.getParameter("cardname") + ".");
    else
      out.println("<h3>" + messages.getString("OrderError"));     

    out.println("<p> &nbsp; <p><strong><a href=\"" +
        response.encodeURL(request.getContextPath()) +
        "/enter\">" + messages.getString("ContinueShopping") + "</a> &nbsp; &nbsp; &nbsp;" +
        "</body></html>");
    out.close();
  }

  public String getServletInfo() {
      return "The Receipt servlet updates the book database inventory, invalidates the user session, " +
              "thanks the user for the order.";
  }
}

